Got a data breach letter from Quantum Health?
Dapeer Law, P.A. is investigating a potential class action against Quantum Health, a Dublin, Ohio company that provides healthcare navigation and care coordination services to employers with self-insured health plans, on behalf of individuals whose information was involved in the data security incident of May 29 to June 1, 2026.
Latest on the Quantum Health data breach
- : The Texas Attorney General posted an updated breach notice from Quantum Health, Inc. listing 1,911,559 affected individuals, including 273,111 Texans. Quantum Health also reported this incident to the Vermont Attorney General on Oct 28, 2026. We added both to the sources below.
- : Dapeer Law opened its investigation following notice filings posted by state regulators.
Who qualifies for the Quantum Health data breach investigation
You may be eligible to participate in a class action if any of the following applies:
- You received a data breach notification letter from Quantum Health.
- Your letter offered identity monitoring through Kroll at no cost to you, including single bureau credit monitoring, fraud consultation and identity theft restoration.
- Quantum Health determined that some of the files involved in the incident contained your information. Quantum Health provides healthcare navigation and care coordination services to employers with self-insured health plans.
- No proof of harm required to consult with counsel. You do not need to have already suffered identity theft to explore your legal options.
- Excluded: individuals who did not receive a breach notice and whose information was not involved in the incident.
Not sure if you qualify?
Send us your notice, we'll confirm your eligibility at no cost.
What happened in the Quantum Health data breach
On June 1, 2026, Quantum Health detected a service outage that affected the availability of certain internal and external systems, according to its notice letters. The letters say the investigation determined that the outage was related to unauthorized access to Quantum Health's IT network, resulting from a user responding to a vishing call on May 29, 2026, and that between May 29, 2026 and June 1, 2026, the unauthorized party accessed and acquired files from certain Quantum Health systems. On July 8, 2026, the investigation further determined that some of those files contained individuals' information. The California and South Carolina letters say Quantum Health reported the incident to federal law enforcement and began notifying the Plans on July 27, 2026.
The Massachusetts letter says some of the files involved contained your name and one or more of the following: Social Security number, health insurance information (such as insurance policy number or claims/benefits information), health information (such as medical information, treatment information, diagnoses, prescriptions, provider names, and dates of service), and other personal information (such as date of birth, email, address, phone number, or demographic information). The California and South Carolina letters list your name and one or more of the following: health insurance information (such as insurance policy number or claims/benefits information), health information (such as medical information, treatment information, diagnoses, prescriptions, provider names, and dates of service), and other personal information (such as date of birth, email, address, phone number, or demographic information), and say Quantum Health could not rule out the possibility that your Social Security number was also involved. All three letters offer identity monitoring through Kroll at no cost, with the number of months left blank in the posted letters.
Quantum Health reported 1,911,559 affected individuals to the Texas Attorney General, including 273,111 Texans, in a report posted by the Texas Attorney General on October 28, 2026. The Texas filing lists name of individual, Social Security number information, medical information and health insurance information. Quantum Health reported 2,104 affected individuals to the U.S. Department of Health and Human Services, which lists the breach as a Hacking/IT Incident involving a network server. The Vermont Attorney General's table lists 2,360 Vermonters affected and lists Social Security numbers and health records. State filings also list 6,481 South Carolina residents and 1 Massachusetts resident.
Why Quantum Health had your information
Quantum Health provides healthcare navigation and care coordination services to employers with self-insured health plans.
Your letter still qualifies for a free review.
What to do if you got a Quantum Health data breach letter
Keep your notice letter
Do not discard it. Your letter contains the Kroll activation code and verification ID, and it is important evidence if you decide to participate in a lawsuit.
Activate the free Kroll identity monitoring
Activate the Kroll identity monitoring offered in your letter at Enroll.krollmonitoring.com/redeem before the activation deadline printed in your letter. Accepting this benefit does not waive your right to pursue legal action.
Place a fraud alert or credit freeze
Contact Equifax, Experian, and TransUnion to place a fraud alert or freeze on your file. Request a free weekly credit report from AnnualCreditReport.com, and use the FTC's IdentityTheft.gov recovery guide.
Speak with a data breach attorney
Consultations with Dapeer Law are free and confidential. We'll review your notice, explain your options, and advise whether you may be eligible to join a class action.
Submit your notice for a free review
Two minutes online. A licensed attorney reviews every submission.
Quantum Health breach timeline
Compensation you may be entitled to
Out-of-pocket expenses
Credit freezes, identity restoration services, and other costs incurred responding to the breach.
Time spent monitoring
Hours spent reviewing accounts, disputing fraudulent charges, and dealing with identity theft issues.
Identity theft & fraud losses
Unreimbursed funds stolen from accounts, unauthorized credit lines, or tax refund fraud tied to the breach.
Statutory damages
Certain state data breach and consumer protection statutes provide for fixed damages regardless of actual loss.
Injunctive relief
Court orders requiring Quantum Health, which provides healthcare navigation and care coordination services to employers with self-insured health plans, to implement stronger data security practices going forward.
Compensation categories depend on applicable state law, the types of data exposed, and documented losses. No recovery is guaranteed.
Quantum Health data breach FAQ
I received a data breach letter from Quantum Health. What should I do? +
Keep the letter, activate the free Kroll identity monitoring before the activation deadline printed in your notice, review your account statements and free credit reports for unauthorized activity, consider a fraud alert or credit freeze, and contact a data breach attorney for a free consultation. Activating monitoring does not waive your right to pursue a claim.
Is the Quantum Health data breach letter real or a scam? +
Quantum Health has reported this incident to the California, Massachusetts, Texas and Vermont Attorneys General, the South Carolina Department of Consumer Affairs and the U.S. Department of Health and Human Services Office for Civil Rights. Compare your letter to the official filing linked in Sources below, and use only the enrollment website and phone number printed in your letter. Be cautious of unexpected calls, texts or emails about the breach that ask for your Social Security number or account login. If you are unsure, send your letter to Dapeer Law for a free review.
Why did I get a Quantum Health letter if I never used Quantum Health? +
The California and South Carolina letters say Quantum Health provides healthcare navigation and care coordination services to employers with self-insured health plans, which the letters call "the Plans," and that Quantum Health began notifying the Plans on July 27, 2026. The U.S. Department of Health and Human Services lists Quantum Health as a business associate. The letters do not say which plan your information is connected to. Your letter lists a phone number, (844) 958-8913, for questions about the incident.
Am I eligible to join a class action against Quantum Health? +
If you received a breach notice letter from Quantum Health about this incident, you are likely eligible for a free case evaluation. Eligibility depends on your state of residence, the categories of your data that were involved, and any losses you have suffered. Dapeer Law will review your notice at no cost.
How much money could I receive from a class action lawsuit? +
Data breach class action recoveries vary significantly. Settlements typically range from a few hundred dollars for basic out-of-pocket losses to several thousand dollars for documented identity theft, with class size, damages, and negotiation all affecting the final amount. No payout is guaranteed, and this investigation has not yet resulted in a settlement.
What personal information was exposed in the breach? +
The Massachusetts letter says some of the files involved contained your name and one or more of the following: Social Security number, health insurance information (such as insurance policy number or claims/benefits information), health information (such as medical information, treatment information, diagnoses, prescriptions, provider names, and dates of service), and other personal information (such as date of birth, email, address, phone number, or demographic information). The California and South Carolina letters list your name and one or more of the following: health insurance information (such as insurance policy number or claims/benefits information), health information (such as medical information, treatment information, diagnoses, prescriptions, provider names, and dates of service), and other personal information (such as date of birth, email, address, phone number, or demographic information), and say Quantum Health could not rule out the possibility that your Social Security number was also involved. The Texas filing lists name of individual, Social Security number information, medical information and health insurance information. The Vermont Attorney General's table lists Social Security numbers and health records. The letters do not say which of the listed items were in the files for you.
Did Quantum Health offer free credit monitoring? +
Yes. The Massachusetts, California and South Carolina letters offer identity monitoring through Kroll at no cost, including single bureau credit monitoring, fraud consultation and identity theft restoration. The number of months is left blank in the posted letters, so check your letter for the length and the activation deadline. Activation is separate from, and does not waive, your right to pursue a claim.
How many people were affected by the Quantum Health breach? +
Quantum Health reported 1,911,559 affected individuals to the Texas Attorney General, including 273,111 Texans. It reported 2,104 affected individuals to the U.S. Department of Health and Human Services. These two company-reported totals differ. State filings also list 2,360 Vermonters, 6,481 South Carolina residents and 1 Massachusetts resident. This page will be updated as additional information becomes available.
Is there a deadline to take legal action? +
Yes. Statutes of limitations for data breach claims vary by state and legal theory, typically ranging from one to six years. Waiting can permanently bar your claim. Contact us as soon as possible for a free evaluation.
How do I get a copy of the official breach notice? +
The California Attorney General posts a sample of Quantum Health's notice letter on its data breach website (linked in Sources below). Sample letters are also posted in Massachusetts and by the South Carolina Department of Consumer Affairs. If you received a letter but no longer have it, Dapeer Law can still review your situation during your free consultation.
Sources & references
- Official breach notice filing · California Attorney General, Quantum Health, Inc. notice letter
- Secondary regulator report · Massachusetts Attorney General, breach notice filing (Quantum Health, Inc., reported Jul 30, 2026)
- Secondary regulator report · South Carolina Department of Consumer Affairs, breach notice filing (Quantum Health, Inc., reported Aug 17, 2026)
- Secondary regulator report · Texas Attorney General, Data Security Breach Reports (Quantum Health, Inc., posted Oct 28, 2026)
- Secondary regulator report · Vermont Attorney General, Security Breach Notices (Quantum Health, Inc., reported Oct 28, 2026)
- Secondary regulator report · U.S. Department of Health and Human Services Office for Civil Rights, HIPAA Breach Portal (Quantum Health, submitted Jul 29, 2026)
- Credit bureau freezes · Equifax · Experian · TransUnion
- Free weekly credit reports · AnnualCreditReport.com
- Identity theft recovery guide · FTC IdentityTheft.gov
Don't let the deadline decide for you. Submit your claim today.
You only have a limited window to act. Our team will review your notice, explain your options, and tell you whether you may be eligible to recover compensation, at no cost to you.
